Improvement in stop-valves



J. H. STREHL|.

ImprovementA in Stop-Valves. No'. 114,725. Patented May 9,1871.

MdB-est I Invent or 4M F/mra-LrrwGMf//lc co. Mx {assuma-'s moms) Y l L i l anni sate tutti @fitte Letters Patent Nav-114,725, dated May 9, 1871.-

IMPROAVEMENT IN STOP-VALVES.

The Schedule referred to in these Letters Patent and making p'axt of thesame.

y.Nature and Objects of Invention.

My invention relates to double-seated stop-valves, in which the-water-wa'y, when the valve is open, is direct, free, and unobstructed; and consists in the combination of a tapering-sided t'lonble-face valve tted with rings for faces, and two sleeves fitted with rings for seats, the sleeves 'being so attached to the shelLor case of thestop-valve that the valvel may seat with uniform pressure upon the entire surface of both seats.

Description of the Accompanying Drawing.

Figure l is a vertical section of my improved stopvalve in the open position.`

Figure 2 is va vertical section of the same in the closed position.

Figure 3 is a face view of the 'valve detached.

Figure 4 is an end view of one ol' the sleeves.

General Description.

A is the shell or casing of the valve, and

B the covering of the same, iitted with the customary stutiing-box C.

I) is the key or valve-stem', terminating in a screw at the Aend, and ttedwith a nut, E, inclosed within the valve F. l

The valve F being generally of large size and weight is made of cast-iron, and in order to obtain noncorrosive seats or faces for the same forxn circular grooves, f, in the casting, and insert therein brass rings, G.

'.lhe rings G are forced linto the grooves f after the valve F has been hea-ted suciently to expand it, and the shrinkage of the casting in cooling causesl it to hug the rings G tightly,:thus preventing their displacementin use.

lhe 'sleeves H H', which are necessarily heavy for large-size stop-valves, are also i'ormed of cast-iron, and counterbored for the reception of the brass rings I I', which form the seats, and are also secured firmly by the heating and shrinking oi' the sleeves upon them.`

The exterior of the sleeves H H and the interior ofthe sockets a for the' reception of the same, within the casing or shell A, areribbcd or roughened, as'

shown, and a space between thesaid sleeves and cassing A is left for the reception of molten metal to s ecure the sleeves rmly in place. Before the molten metal is poured in, however, the sleeves are drawn tightly against the faces of' the valve F, when the latter is in the closed position, by the use of temporary bolts or screws inserted lin thevalve and pressing against clamps which rest against the slight projections h. The' sleeves and valve are thus held firmly together with uniform pressure upon the entire valvesurface until the metal is run in and calked.

'The rounded edges h of the sleeves facilitate the entrance and operations ofthe calking-tool.

To provide against the possible contingency of the giving way of the sleeves in the soft metal surrounding them `while in use, I provide .the interior collars a', and form. upon the rounded ends of the sleeves right-angle ribs or Webs, h, between which and the Vcollars a small pieces of metal, J, are driven in and swaged, by hammering, to the dovetail form shown, so as to prevent an escape.

By reason of the provision of the molten metal to secure the sleeves H H in place there is no dilculty in giving the valve an equal and full bearing upon both seats, and this is done without the necessity of accurate workmanship in the preparation of the valve and sleeves. Cheap and accurate manufacture is, therefore, secured without skilled labor.

My peculiar method of connecting.,r the rings II and G G to the sleeves H H and valve F enables the ringsto be turned upon an ordinary mandrel and faced off upon the periphery, and both sides at one operation, the inside of the rings n ot requiring boring. The iron castings are also simply counterbored at one op-I eration to receive the rings.

rIhis device, also, for enclasping the rings on the exterior edge, permits of their being swaged to lit tightly after becoming loose in use.

Claims.

1. The seats H I andH I', secured in tbecase by means of molten metal poured 'around them while they are clamped to the valve, substantially as and for the purpose set forth.

-2. In combinatin with the lseats secured as set forth inthe preceding claim, the collars a of thecase, and fastening pieces J, substantially as and for the purpose set forth.

In testimony of which invention I hereunto set my hand.

JOSEPH H. STREHL'I. Witnesses:

FRANK MILLWARD, J. L. WARTMANN. 

